Finding the Fourth Proportional to 21,836.89, 30,134.73 and 12,405.25

Step by Step Solution

1. Step 1: Write the proportion equation
   21,836.89 : 30,134.73 = 12,405.25 : x
2. Step 2: Convert to fraction form
   21,836.89/30,134.73 = 12,405.25/x
3. Step 3: Cross multiply
   21,836.89x = 30,134.73 × 12,405.25
4. Step 4: Simplify right side
   21,836.89x = 373,828,859.33
5. Step 5: Solve for x
   x = 373,828,859.33/21,836.89
6. Step 6: Final answer
   x = 17,119.14